I'll miss grandiose phonetist's pronouncement (7)

I believe the answer is:

palatal

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'pronouncement' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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(Another definition for palatal that I've seen is " Using roof".)

I've seen this clue in The Times.

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